In the birds, butterflies and some reptiles, sex is still chromosomal, but the male that possesses two identical sex chromosome while the female has two different sex chromosome,  in this case which one is determining  sex?

#Question id: 10172

#Unit 6. System Physiology – Plant

leaves continuously adjust the orientation of their laminae such that they remain perpendicular to the sun’s ray and maximize light absorption by

#Question id: 28164

#Unit 13. Methods in Biology

It is possible to calculate the number of clones that must be present in a gene library to give a probability of obtaining a particular DNA sequence. This correct formula is:

#Question id: 3335

#Unit 11. Evolution and Behavior

Consider hypothetical populations that have arisen from the mixing of migrants from different sources: f(AA)- 0.30   f(Aa)- 0.0     f(aa)- 0.70 After one generation of random mating within population, what will be genotypic frequencies?

#Question id: 11206

#Unit 7. System Physiology – Animal

Tetrodotoxin blocks voltage-gated sodium channels, and ouabain blocks sodium-potassium pumps. If you added both tetrodotoxin and ouabain to a solution containing neural tissue, what responses would you expect?

#Question id: 32269

#Unit 2. Cellular Organization